The short answer is no.  Businesses face potential lawsuits for business invitees, employees (WC or family) and others due the risk of transmission arising from business activities.  

Pennsylvania has not advanced legislation to protect business from liability suits.  The only measure has been Governor Wolf's executive order comment, which effectiveness remains uncertain.   

The National Council of State Legislators tracks the legislative efforts of each state. COVID-19 Liability Legislation (ncsl.org) reports:

In the 2020 regular and special legislative sessions, 32 states, Guam, Puerto Rico and the District of Columbia introduced 184 bills to address COVID-19 liability issues. From those proposed measures, 21 states, Puerto Rico and the District of Columbia enacted legislation in 2020. In these states, 27 enacted bills addressed health or medical liability, 28 addressed business or general liability and 11 addressed PPE liability.